create count matrix in R -


this question has answer here:

i have large dataframe shown below few rows , column:

    id1 id2 id3 id4 s1  2   4   2   6 s2  2   1   3   2 s3  2   2   2   2 s4  3   0   2   2

for each row need matrix count of each number in range of id value. since largest 6 in id values, creates matrix 7 columns i.e. 0 6 , fill count values.

sample output:

    0   1   2   3    4    5    6 s1  0   0   2   0    1    0    1 s2  0   1   2   1    0    0    0 s3  0   0   4   0    0    0    0 s4  1   0   2   1    0    0    0

is there way of doing in r.

this perfect situation use apply + tabulate, except inclusion of zeroes in data , need include them.

since need include tabulation of zeroes, make small modification tabulate start @ 0 instead of 1.

here's function puts approach in place:

dftabulate <- function(indf) {   nbins <- max(indf)   `colnames<-`(t(apply(indf + 1, 1, tabulate, nbins = nbins + 1)), 0:nbins) }

here applied sample data.

dftabulate(mydf) #    0 1 2 3 4 5 6 # s1 0 0 2 0 1 0 1 # s2 0 1 2 1 0 0 0 # s3 0 0 4 0 0 0 0 # s4 1 0 2 1 0 0 0

you specify have "large" data.frame don't describe how large, i'm not sure how relevant following benchmark is.

however, share logic behind using approach: tabulate fast function, thought make use of efficiency.

here's benchmark:

set.seed(1) nrow = 10000 ncol = 100 min = 0 max = 500 mydf <- data.frame(   matrix(sample(min:max, nrow*ncol, true),           nrow = nrow, ncol = ncol,           dimnames = list(paste0("s", 1:nrow), paste0("id", 1:ncol))))  fun2 <- function(df1 = mydf) {   tbl <- table(c(row(df1)), factor(unlist(df1), levels=0:max))   dimnames(tbl)[[1]] <- row.names(df1)   tbl }  fun3 <- function(df1 = mydf) mtabulate(as.data.frame(t(df1)))  system.time(dftabulate(mydf)) #    user  system elapsed  #   0.000   0.000   0.154  system.time(fun2(mydf)) #    user  system elapsed  #   0.000   0.000   1.018  system.time(fun3(mydf)) #    user  system elapsed  #   4.560   0.000   3.081

Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more